package com.guomao.demoj;

import java.util.*;

public class JavaDemoC {


    public static void main(String[] args) {


        Set<String> synchronizedSet = Collections.synchronizedSet(new HashSet<String>());
        System.out.println(synchronizedSet.getClass().getName());

        List<String> synchronizedList = Collections.synchronizedList(new ArrayList<String>());

        SortedMap<String, String> sortedMap = Collections.synchronizedSortedMap(Collections.synchronizedSortedMap(new TreeMap<String, String>()));

        List<String> list = Arrays.asList("a", "b", "c", "d", "e", "f", "g", "h", "i");


    }


}
